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Enriched cereal bars are more effective in increasing plasma quercetin compared with quercetin from powder-filled hard capsules

  • Sarah Egert (a1) (a2), Siegfried Wolffram (a3), Beate Schulze (a4), Peter Langguth (a5), Eva Maria Hubbermann (a4), Karin Schwarz (a4), Berit Adolphi (a6), Anja Bosy-Westphal (a2), Gerald Rimbach (a7) and Manfred James Müller (a2)
  • DOI: http://dx.doi.org/10.1017/S0007114511003242
  • Published online: 20 July 2011
Abstract

The flavonol quercetin, is one of the major flavonoids found in edible plants. The bioavailability of quercetin in humans may be influenced by the food matrix in which it is consumed as well as by its chemical and physical form. The objective of the present study was to investigate the biokinetics of quercetin from quercetin-enriched cereal bars and quercetin powder-filled hard capsules. In a randomised, single-blinded, diet-controlled cross-over study, six healthy women aged 22–28 years took a single oral dose of approximately 130 mg quercetin equivalents from either quercetin-enriched cereal bars (containing 93·3 % quercetin aglycone plus 6·7 % quercetin-4′-glucoside) or quercetin powder-filled hard capsules (100 % quercetin aglycone). Blood samples were drawn before and after quercetin administration over a 24 h period. The concentrations of quercetin and its monomethylated derivatives, isorhamnetin (3′-O-methyl quercetin) and tamarixetin (4′-O-methyl quercetin), were measured by HPLC with fluorescence detection after plasma enzymatic treatment. The systemic availability as determined by comparing the plasma concentration–time curves of quercetin was found to be five times and the cmax values six times higher after ingestion of 130 mg quercetin by quercetin-enriched cereal bars than after ingestion by quercetin capsules. In contrast, tmax did not differ significantly between the two treatments. The cmax values for isorhamnetin and tamarixetin were four and nine times higher after ingestion of quercetin by quercetin-enriched cereal bars than after ingestion by quercetin capsules. In conclusion, quercetin from quercetin-enriched cereal bars is significantly more bioavailable than from quercetin powder-filled hard capsules.

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*Corresponding author: S. Egert, fax +49 228 733217, email s.egert@uni-bonn.de
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  • ISSN: 0007-1145
  • EISSN: 1475-2662
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